420 HYMENOPTERA. 



fusco-hyaliiie. Abdomen smooth and shining, the first segment 

 very dehcately punctured, the following segments more distinctly 

 so ; the second and three following segments with an ovate pale 

 yellow macula on each side at their basal margin ; the apical 

 segment produced into an obtuse spine, which has a sharp raised 

 margin, and is covered sparingly with oblong punctures. 



Hab. North America. 



137. Crabro confluentus. B.M. 

 Crabro confluentus, Say, Bost. Journ. i. 3/6. 



Hab. N. America (Indiana). 



138. Crabro collinus. B.M. 



Male. Length 5 lines. — Black : the head closely punctured ; 

 the clypeus and face with a golden pubescence ; the cheeks thinly 

 covered with silvery pubescence ; the antennse simple ; the scape, 

 basal joint of the flagcllum, and the mandibles, yellow, the apex 

 of the latter black. Thorax : the mesothorax coarsely punc- 

 tured; the metathorax with a transverse enclosed space at its 

 base, which is closely punctured, and with a series of deep fos- 

 sulets around its margins, the sides and posterior portion very 

 coarsely rugulose ; the collar, tubercles, a spot on the tegulse in 

 front, and the post-scutellum, yellow ; the legs yellow, with the 

 femora reddish ; wings fusco-hyaline, the tegulse ferruginous. 

 Abdomen shining, closely punctured, most sparingly but most 

 strongly so at the base ; an elongate-ovate yellow spot on each 

 side of the three basal segments ; the two following have a trans- 

 verse narrow yellow band, the first slightly interrupted. 



Hab. East Florida (St. John's Bluff). (Coll. R. Foster, Esq.) 



139. Crabro chrysarginus. B.M. 



Crabro chrysarginus, St. Farg. Ann. Soc. Ent. Fr. iii. 711- 12 ; 



Hym. iii.' 114. 12. 

 Crabro arcuatus. Say, Bost. Journ. i. 377^ 

 Crabro chrysargurus, Dahlb. Hym. Europ. i. 386. 257- 



Hab. N. America (Indiana) ; Hudson's Bay. 



140. Crabro aurifrons. B.M. 



Female. Length 6 lines. — Black : the clypeus and face co- 

 vered with golden pubescence ; the scape, basal joint of the fla- 

 gellum, and the mandibles, yellow outside; the head as wide as 

 the thorax, delicately punctured, with the ocelli in an obtuse 



